Bio - Ch 2 Pretest

The positively charged particle in an atom is the

• neutron

• ion

• proton

• electron

Two or more different atoms are combined in definite proportions in any

• symbol

• isotope

• element

• compound

A covalent bond is formed by the

• transfer of electrons

• sharing of electrons

• gaining of electrons

• losing of electrons

Tags

NGSS.HS-PS1-1

When you shake sugar and sand together in a test tube, you cause them to form a

• compound

• mixture

• solution

• suspension

A compound that produces hydrogen ions in solution is a(an)

• salt

• acid

• base

• polymer

In polymerization, complex molecules are formed by the joining together of

• macromolecules

• carbohydrates

• polymers

• monomers

Proteins are polymers formed from

• lipids

• carbohydrates

• amino acids

• nucleic acids

Tags

NGSS.HS-LS1-1

An enzyme speeds up a reaction by

• lowering the activation energy

• raising the activation energy

• releasing energy

• absorbing energy

In a chemical reaction, a reactant binds to an enzyme at a region known as the

• catalyst

• product

• substrate

• active site

In atoms, which particles are in constant motion around the nucleus?

• protons

• protons and neutrons

• neutrons

• electrons